Combined lock and latch



. E. o. MURMANN COMBINE]; LOCK AND LATCH iled F b 19,23 2 Sheets-Sheet 2 INVENTOR. Faye/7e O. Murmmn ATTORNEYS.

Patented June 3, 19 24.

TES

EUGENE O. MURMAHN, OF GLENDALE, CALIFORNIA.

COMBINED LOCK AND LATCH.

Application filed February 8, 1923.

To all whom it may concern:

Be it known that I, EUGENE O. MURMANN,

a citizen of the United States, and resident of Glendale, in the county of Los Angeles and State of California, have invented new and useful Improvements in a Combined Look and Latch, of which the following is a specification.

This invention relates to a combined lock and latch structure and pertains more particularly to the casing or housing therefor. It has been found desirable to provide mortise locks and latches so constructed that they are housed in cylindrical casings, thereby permitting the recesses in the door to be bored. The present invention contemplates a twin casing consisting of a cylindrical unit for the latch, and a cylindrical unit for the lock joined together.

The primary object of this invention is to provide a casing of the character described having novel features of structure, which produce a simple, strong'casing, easily assembled and readily manufactured.

The nature and scope of the present invention will be apparent from the subjoined specification taken in connection with the embodiment of the invention illustrated in the accompanying drawings, in which:

Fig. 1 is a perspective view of the lock and latch ready forinstallation; Fig. 2 is a vertical section through the casingshowing the lock mechanism in elevation; F ig. 3 is a section taken on the line 3-3 of Fig. 2; Fig. 4: is a fragmentary horizontal section through the casing at the face plate end; Fig. 5 is a perspective view of one-half of the casing; Fi 6 is a perspective view of the cap; Fig. T is a perspective view of a fragment of the face plate; Fig. 8 is a horizontal section through the face plate showing a portion of the casing; and Fig. 9 is a perspective View on an enlarged scale of the pin for clamping the face plate and sections of the casing together.

Referring more particularly to Fig. 2, a latch bolt is indicated by 10. The bolt is provided with a stem 11, having an abutment 12 for engagement by an arm or a door knob shank. A stationary guide 13 keeps the stem 11 centered, the stem sliding therein, and a spring 1 L disposed on the stem tends to keep the latch in protracted position.

The lock comprises a bolt 15 having a tail 16 pivotally secured thereto. The tail has a coupling notch 17 on its under side to Serial No. 617,712.

receive the operating arm of a key actuated mechanism. The tail is also provided with deadlocking notches 18 and 18 to, receive a deadlock lug. Secured to the upper side of the tail is a leaf spring 19 which'tends to force the tail downwardly.

The latch and bolt extend through openings in a face or selvage plate 21 which closes one end of the casing. In the plate above the latch casing and below the bolt opening are recesses 22 to receive lugs on the casing. The casing is split and forms in section a figure of dumb bell form, as shown in Fig. 3. There are two cylindrical portions, one for the latch and one for the lock joined by a tie portion. The line of division between the sections is along the major axis. Each half of the casing comprises a latch section 23, a tie section 24,and a lock section 25. formed on the casing. The latch section is reduced in diameterat its rear end as indicated by 28 and is extended beyond the tie section.

In a similar manner lock section 25' is reduced in diameter and extended beyond the tie portion. At the top of the latch'section there is an opening 29 for the door knob mechanism to connect with the abutment 12. There is an opening 30 in the locksec- Lugs 26 and 27 are tion on the lower side for passage of the 7 arm connecting the tail of the boltwith the key actuated mechanism. The guide disk 13 is held in position in the latch casing by tongues 31 engaging corresponding openings in the casing. It will be noted that when the halves of the casing are placed together, there is a chamber joining the latch and lock portions, in which an arm 32 formed on the tail may slide. This arm extends into the latch portion and is disposed to engage the latch 10 when the bolt is protracted so that the latch cannot be moved. The full lines in Fig. 2 show this position.

At the forward end of the casing and in the tie sections are corresponding elongated openings 33 to receive an arcuate wedge pin 34:. The pin is provided with a threaded opening at its center to receive a screw 35 which is extended through the face plate 21. A twin cap head is slipped over the projecting rear end of the lock and latch housing to close the same. This structure is best shown in Fig. 6 and comprises a cap 36 secured to a cap 37 by a loop 38. The loop is adapted to extend into the tie chamber as shown in Fig. 2. Extending through the walls of the tie chamber at the rear end are openings to receive a bolt 39, the latter assisting in holding the cap in position by passing through the loop. Au arm 4C0 on the cap 37, has a lug 4L1 which extends into the lock housing and cooperates with-the notches 18 and 18 on the tail.

The latch and lock mechanisms are placed in posit-ion in the sections of housing and they are held together by slipping the cap structure into position and bolting it. The pin 33 is placed in-position and the face plate placed over the end of the housing. The face plate is positioned by the lugs 26 and 27 entering the recesses in the plate. Screw 35 is now passed through the plate and engaged with the pin and the latter tightened. This firmly secures the plate to the housing and tightening of the screw draws the halves of the casing toward one another, firmly clamping them in position. The pin 33 performs the double function of holding the face plate in position upon the casing and drawing the halves of the easing. firmly together.

l/Vhat I claim is:

1. In a mortise lock, a face plate, a split housing including complementary sections having a cylindrical latch housing and a cylindrical lock housing joined by a tie forming a tie chamber, a twin cap head comprising a slip-on cap for the latch and lock sect-ions joined by a loop disposed in said tie chamber, a bolt passing through said sections and through said loop, an arcuate pin passing through said sections adjacent said face plate, and a screw passing through said plate into said chamber and engaging said arcuate pin whereby to clamp the face plate and sections together.

2. In a mortise look, a face plate, a split housing including complementary sections having a latch housing and a lock housing joined by a tie, a twin cap head comprising a slip-on cap for the latch and lock sections joined by a loop, a bolt passing through said sections and through said loop, an arcuate pin passing through said sections adjacent said face plate, and a screw passing through said plate and engaging said arcuate pin between said sections, whereby lo clamp said face plate and sections together.

3. In a mortise lock, a face plate, a split housing including complementary sections having a latch housing and a lock housing joined by a tie forming a tie chamber, an arcuate pin passing through said sections at the tie chamber and adjacent said face plate, and a screw passing through said plate and engaging said arcuate pin in said tie cham ber whereby to clamp the face plate and sections together.

4. In a mortise lock, a face plate, a split housing including complementary sections, an arcuate pin passing through said sections adjacent said face plate, and a screw passing through said plate and engaging said arouate pin between said sections whereby to clamp the face plate and sections together.

5. In a mortise lock, a face plate, a split housing including complementary sections having a latch housing and a lock housing joined by a tie, a twin cap head comprising slip-on caps for the latch and lock section joined by a loop, a bolt passing through said sections and through said loop, a wedge passing through said sections adjacent said. face plate, and a screw passing through said plate and engaging said wedge between said sections whereby to draw and clamp said face plate and sections together.

6. In a mortise look, a face plate, a split housing including complementary sections, a wedge passing through said sections adjacent said face plate, and a screw passing through said plate and engaging said wedge between said sections whereby to draw and clamp the face plate and sections together.

In witness that I claim the foregoing I have hereunto subscribed my name this 27th day of January, 1923.

EUGENE O. MURMANN. 

